Dispersed Phase Content of Ethylene-vinyl Acetate Copolymer/Polypropylene (EVA/PP) In-situ Microfibrillar Composites (MFCs): Influences to Microfiber Morphology, Crystallization Behavior, Rheological and Mechanical Properties
ZHANG Tingting1,2, DONG Jiahao2, WANG Meng1,2,WEI Liangqiang2, QIN Shuhao1,2
1 College of Materials Science and Metallurgy Engineering, Guizhou University, Guiyang 550025; 2 National Engineering Research Center for Compounding and Modification of Polymeric Materials, Guiyang 550014
Abstract: A series of ethylene-vinyl acetate copolymer/polypropylene (EVA/PP) in-situ microfibrillar composites (MFCs) differed in dispersed phase (i.e. PP) content were prepared using a multistage stretching extruder with an assembly of laminating-multiplying elements (LMEs), and the products’ microfibers morphology, crystallization behaviors, mechanical and dynamic rheological performances were studied. The results showed that PP couldform microfibers in situ in EVA, and more PP content would lead to obviously more large-diameter microfibers and higher storage modulus (G′) and loss modulus (G″) of the MFCs. The systems with PP contents below 10wt% were partially compatible, while the phase separation occurred in systems with PP contents over 10wt%. PP microfibers could enhance the tensile performance of EVA effectively, as the EVA/20wt%PP MFCs owned the maximum tensile strength of 16.71 MPa, which was 42.9% higher than that of pure EVA. We also observed an obstructive effect of PP microfibers on the crystallization behavior of EVA, which consequently attenuates the crystallinity of the MFCs.
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2018, Vol. 32 
